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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '657ad12aefce778feb5d540193fcc4e65c0cb686276586ea05cad02d095d17c6' 
  AND token = '11RsgoqZyo5CMiiXCrEcBSyx+a+UJFOypboXi8Fb3Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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