SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ca941d1431326db2f8586767a1046f7894a92503126b9e45c4b34d75d68211' 
  AND token = 'e/qF40n4j60E9rBkXqH+I3veKujQ0lTMKEVyA+t1Wgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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