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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d701ad143b633c0195722d869ab427d7e89a15dfcfc075806cef642cbdc565a' 
  AND token = 'yP2U+dSzDLK8/qCcLHBis5wyg6jL52OGoVyfapEDM6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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