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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f719488a3c4ee89b92489efa109474e6ac3bac5f4f4916aaf75b8a82b89221b9' 
  AND token = '49AA7PYTGd2xgqgS6qL1Zf62cUqNM709lctRtBmsLnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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