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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d8db4c28c4ffa05f8d409d655f3b18916e3cfa89f5df2d55747f8eab53ee453' 
  AND token = 'jOxqINprkFEN9Wye6M7Xv0zCs72OM7sq7+rsvXe6Ljs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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