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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d22872559fe279943b05272e097c4785b55ed628ffcde108f27dd013e92d54' 
  AND token = 'LEw4hIrXg5Ha95APvsCfZw1Jeut8H8aNn6mTVcGOkH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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