SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '137ad431c0f20b1479c7f6dfed218bfe54de820eb6efe55eda4481d9cb5b170a' 
  AND token = 'jSGKMh86vm6XNZ/RXIB5gFX3BMhJCcs6LA1uRqmQTvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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