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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a119a2fb5b7bdc561c8a98c727c6c519e1b20ffafc7950fd5c6371cf5818940d' 
  AND token = 'zmIQMBGCq84eFNWPsCUBZzJzCoMD4mgfiCPE+2Wy6Aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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