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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8e4c0f1783fc0c7fff47fb4426d17c1434d1a384a3f1a7dc81936310be733db' 
  AND token = 'hpjZsqzy/clP7JWiQbJXoPfQPas4Mju2yPpLeOpL+34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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