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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '890c6d1ead3cd61de7ea1283fe669da60b77e078a7100e7a9b662fe84d26dfec' 
  AND token = 'deBG5Y+HKWyEj8/gZcu4EIVf6o5k4M3U836B0W+QGgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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