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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d128c7d38a5dbc3d56fb7602a478d6e1253130026d54a6827124ffae230e49' 
  AND token = '46aqoj01qD3DIYA2P7zQkDW8FRBFKF4bxjybWd8w+Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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