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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '633e0f7ec6538523db62e426ec76a43d3f044912a8071493d33c9ed121101b7a' 
  AND token = '4axvsU3f9QIqilhrsT38cKd/Z+vhIK9m4jubLpBRkcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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