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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6062081cd59153dacbf9cf809dfe72dbd1dc5b3c46f9c0ad9dd9b92bccf92c9' 
  AND token = 'sagH0qarGOUINAOuKD3sLEbCgqQl+8jXiQViESzcoj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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