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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c67e45f31cf974c9310a4ae84fc9510f7688e8467f7cb348afb5842ee7a6a83' 
  AND token = 'Pz7k+Emeq8labjglmKaakQ0Ch+S+w/LGmBd7OuO9EcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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