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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df06b35284d17c4260acaff438ad6b629ebf4734f8a8a9a2a3bd0926ebaf4fd' 
  AND token = '7GNi85Wgy/FyLEfIqQNf0oc78+fa1TXu3CN8JY9sPPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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