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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e2ffb373b9e04ea9bd51b99b0b26f55845be68efe8a321c028d5236f95e49f' 
  AND token = 'TpviLDzxR6bahBcl/tz3rgPirbnWX41G+f+Xv7jcN74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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