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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d5b1a9f2512b3f4000fdbf54851972c17afe592f84ec31e61af57b7520e07cb' 
  AND token = 'r7JvbaP9QfDIlZto2J8deIXOW0fh/io0jgLlESKWfqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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