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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e482d54c403ddad585ceaa1388300b83633fb0b24e9093e9e32a5c2bf31ccf3b' 
  AND token = 'qgr7Dtk6UkaOj23GClAYyOMJibX3OAbN+9TQvnTkPwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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