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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '699bd2aaf8bca9bbc9eb8a42a01029f2d6b9de9ea7782e40400d3d962263617f' 
  AND token = '1PnUOAYv01nce/zgKPiyBGCOY/I/Xz29HAq74lEccQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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