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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b355017026c9dcf4305e54b83fcdb2c64dc26326c3d02c160b0e47e5aa9f653' 
  AND token = 'TlnnaxzFHkuJfax4y3X7Iu9BGke2kiYNEMacpinVaYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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