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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21e9572ab22aa5386c340312e92b7aade6c5bc7cd531933f575bd01377a5bcc2' 
  AND token = '8PWdAN4ocVLa2dW3BWkALLSYk3RMXZA0+0CIFzyeT/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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