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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faec9ec59e529c67aab162a5979df60bf26123dc13cfd635168371cca5b35e0e' 
  AND token = 'Z4LZA7rBYJpKE7UoKmmS70/lymNHwUa6Fs5G985BDTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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