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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26534000b49980a026634cbd71cc1ad3ac8a4838706417c651acb3b90ecf59f' 
  AND token = 'JOqCvCeYM0KUhXmR+E6pQMD5Nd4b86S1E4CjLVjPoTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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