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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcff6a1c6ec2182deb7858f9d2f2d9832321a955f2e6ec66721a12387a812609' 
  AND token = 'KAEGzjceeia20goVMbYyxonUt8TJj13m5H2JeRzLmfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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