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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef89b904910194f38aa862773a73898ed4884dd6e5fe00a8d10169c7a430f025' 
  AND token = 'NzV0fkw6dAJ8kYIjobP80uOI0iVVRTO+ccVoBbOPj1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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