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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9efeb5253437a867a5f2d8e5a6b1d299b7a0ae4fe26c58e5b95c198a1847b297' 
  AND token = 'rexqUleRXuain3fRaVXv58/i+I/dhyXVsBpCdBZkl+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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