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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f2f731af01537bce174a5ed9247fc83f40a937ba5cdd4c5b34fff4ca5a4441e' 
  AND token = 'swrhRDxw7IZ8n3/Ido92ZOZUpWbZVsB9k3w4aQayRx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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