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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50a6f1a0db3a96a43a3f8423a845a4c2006959308c9f2030dfca10308cd4353b' 
  AND token = 'o9tVB4AOrzaNgBotuJyN0RA5o0/3E33SP8ZsPSS+tJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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