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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '559b6099c2a62f7f6449b30e69382c5ab08915c6f9973d0083a9f8084ef1dcd1' 
  AND token = '6QyMBxaQr09slRPfspmSwDJalR993hdrhOTSIsXXMrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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