SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f6c7213971276fbb9195bd4af9416d823b2b384c55f1bff99e28ab08e7a874' 
  AND token = 'rJX2hGtgPZpwKXV5yOBpbm1ireUou7E2SSOhF8Cd4zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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