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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a5dfd6c248a0138b0542d4c9651f6da4fa54bb1a946f79388d9422ddc17a6f' 
  AND token = 'Er3F55PsKqXiDGyJ92T/99oSWpV8Je5pxAEF8Ew781M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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