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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a1ab6e29aebf3288095ac8f0ddf974ae40d055419627d1c66045577e7429971' 
  AND token = 'D9W2wlyNEMbaRV7KUMSGA92NWyNXiC2LnQTV1BZpavA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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