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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b88a5ae65fca256333e73499ed758a82c339cc848e27f66e8521a7667de46f' 
  AND token = 'b2bT9VD0cBQ9YAg6m/Nz/+uIlLjsxogH2y3RnOH8XsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}