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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43a2df6681177ab11ac8d04e8567bd761f5b3cc9eb3d6dcd4d109f327f8ca6c7' 
  AND token = 'xSoWiE3Iocu5Yr47vyoBbRGOgJrty0L2D53qiE2GK58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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