SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f656324a5c11919351caf80604a05f904b97c828265f77ac0b877e61a122762e' 
  AND token = 'y4K3JIjMLS86ljIVLmGS0BU4TYKPFirARBKVdZM+6EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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