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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '553c67788ae72622e3736a91d398482b49073ad986734109770c4b2a1b74d17b' 
  AND token = 'qNR/D3qKrbRH45ZgK2g0A9yZF9ZpAZp7YdT4yAJbCXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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