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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc0e062ef6bdf35ab67054a9958a145549531d76b4dd924cae4d03cfbd899f93' 
  AND token = 'TKMpVkTcW8p1XtOgKTJleY8643Fz0Xg1FEfKkAkNp1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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