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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6eb4b3b0990073a69ac5657dbc1cbb14a95d0e0c915403737dd736f9c37ead' 
  AND token = 'cncRsxPJJ09TsDYzTk3t3jO/dYBKPl6Ye40+ICega2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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