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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '623ea176fd9faa9d09762fcdff69c65360f9d4dd1406c784f3231ef216bbaee7' 
  AND token = '+HNU68N7YhGqahX3kvzH7oiEB3lN036ETevRUgKD3fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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