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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804843bbb0f9e32099bfadaf445e688e436448cee260a8bd9ee2d7b8a723e74c' 
  AND token = 'bgXJtjhjXEglvNnnaobmq5HIRilUBcSumq9Yj5KG3KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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