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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '239ce515feafe0e89b8164033c2b1650ae71455b87790fa14511696220ae80ea' 
  AND token = 'F3kJ6pqeT3VMkr9PzN69Iqm2smFLptxm9jE7Wh/fpzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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