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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '069fe92c2d2f99d98fc68b92acb396f51056d018deffcd50bd338981a0116c1e' 
  AND token = '7u8/GmhGvYl44xW7IHV0Wy4QoDYTHo0PBcC5CUT5KZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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