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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0cf8f0ce8778a57bfb82fcea53e20935a11e72411685890e54bd00d7d490cd8' 
  AND token = 'inw+q3AY0frTBix9ZYVxoGxBsDJS2aPb1r7yr9U6Joc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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