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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a35409f3db73193b5c9317e42670063dd2f0fec2279b96f00ed23ca541c3f58b' 
  AND token = '8hs7cgjzybpFCnEi7TZ73vgE+o5Y1J8E83s7YRdtLZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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