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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2315aa40a9658c22134c451f311c8aa89af1598bbfac5f6148c161eb472f9a90' 
  AND token = 'TtAYnl9FE/C8zzHMq25uwGFjKXe02g7Or69wc9gN194=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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