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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffe491a152218c8c18f48286474d3e9c86bd23a564f7db94bdc121145120375e' 
  AND token = 'omhZ4abbrP5/vhwq1Kxr8Z6dDKMkjAEOp049IZOMLXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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