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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12664ae7d572e64edf9e57f35c740a9cce4d33ebbc2518e69511d1453b83129e' 
  AND token = 'kD2F/kcExwVIERFnFFFba1vdpQo5z1dy7LsviYIxP9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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