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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91efc7b0ab5750adf417ccf0dc663b487796dc52dd66d32285e12c5c6b97a6ac' 
  AND token = '8LK4HhuTRVoBZ9YSnVneHVL9vtBGGPNO4Z1c7PvTP4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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