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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71148843e7b6b924687b8bfeb4c56fff33c068bd22192e3e4ec726481e12a7b7' 
  AND token = 'eq6vKvoPKuXDJko1gbq0lPCAGxksIJLF6IU23e4cWBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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