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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd40a641ea3df5d333cf66e0192de4f10a2c1d3e76c552e5af8ab2ecddcdc6ad8' 
  AND token = '3pCh42P94NU2rwUj55UC3BRVjWzw3w+GUuMbNh7evvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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