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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '059be09da2edf8cd698005489547ea392911b0d8d2893f7f7763a685eed59e68' 
  AND token = 'byEXQsg8r144V+AJoEMR+ezoRzsCDpzFSgCEAw+u/q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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