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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8533f3a232abb8cc497a6874f04d356162f957ae6d57937b1e973b5e63f2789f' 
  AND token = '9cny/iupeo3jDHj5VO2Udug5E0VXaHr95kLa3+Dqi/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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