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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbfbb0a080574f34c15d8c9b13c7b2db00b045cbcba446e3d8e9d587f237a184' 
  AND token = 'kjAjXQn3W6bkcj3pEkE8Ed7si7QahLteNVSL7Sg3YUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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