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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae7ab4b4857f7f78f3fd0c56eed1044ce1db3ec666014e33ef6922b5e4a0710' 
  AND token = 'DAhPtD2g6Y0mzTZ4+v5lWHVzsnVNjo9v0J1EzENHTV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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