SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '465504b792c12c4d4a2a6d04e09f879ec3e26bc0682a2187f6e39ba1a5fc1753' 
  AND token = 'hYEvCEBUhqcxHkuoToZVkDKS8rMuUjX+kUWCTG0aS+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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