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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae83189910b4f978cc7e6f88c7c333646a84a5f83a757e5d49a9f58ebc23058b' 
  AND token = 'DJHzxZ8U5okrbnbPksZTD5+r18E57c7Btb0HxprtRyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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