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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a39d64911dd7775816f798da60a30b1c4a062d6cc0788128f3766218e6ef1741' 
  AND token = '82vib7Pdh/2wmNZIArIyf6O7WstOPixpV/hwaNLTkUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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