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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dbd64cd8c392a804333a5448246ffd5d5633f6ef5141aeb878588809d1f73dd' 
  AND token = 'icQBqmVgNhsHIsnyIu8g+7CHLo+hU5aLbmzZHdMmC+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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