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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b52c912971200a2c2c2b9e98a72b33414561bfcf49f67c8a695d91386ac4df1' 
  AND token = 'l3MQuEU6c5IAr0e83rVlT8gbuTrFIGeZ1W5ao5BJTXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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