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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65115e625151784be239870eedea420437dca315c2c34f6e122e91bbe1a069f7' 
  AND token = 'tdgOyTq6Z+F1BnGyu21C8iyRnHrLftZwm9roJah9NYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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