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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd7e6bc382e4a81c11c141296248c3eb2f29df3ffbb6b86f9be36d6dc1ec4928' 
  AND token = 'zRnC0YP5c1BUGsSHKJexDRHMUQ4CW4MFqNG0jOrDH6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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