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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9edaf893baa4d499eb7e6593aef48f428fb8bb58963397ddbdd3ddb94b6b20b' 
  AND token = 'HFvrxYD5itfbAfbdZHsPEJq/3rmi9J9ygUx5zGhXieE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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