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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b90741187a9157cb52b4cf6b817cae27d0698d0d3dc9136cf339f2db2942a420' 
  AND token = '0cUuMYxdRSj12ZLrTnVyllhnhEZj+laPNINtU8hxsVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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