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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a96159c8a178b6cbab49d90e20d8ced0aeb6cc19d1b81165517638cc2f3d7d39' 
  AND token = 'W79D0OPb7ZMvsRhrphlCKFT5In9fdDHNBaQSLIv5Qvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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