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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de86a65a9d563ff71c9ad41037877eeb66f2e988cfc51ed95575d986732ee810' 
  AND token = 'AzJiQeNx/fbonc9MshV/9Xq+ykk9fQ4lhmp77lXJ4No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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