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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '969372e8e63e28c25a1195e66ed502306c105c2a225093d8c65ebdfe2acf6017' 
  AND token = 'o/fRj4My8oMkoMoGhXIH9K98TiJRzdnRFVA52lJk9Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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