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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fc2389dd2828cc87470d284e3537473130f65516e9824765bf1d408d025511f' 
  AND token = 'SWC3156Hz33BAAN8M/3nJn0T3pjf1P7xSpufojRgQSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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