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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fed40ccb528cab32921504fb514950b0cf03d489af6faf0e9732d8fd5a19828' 
  AND token = 'dqINNEq2bGDlolZXtt7nL1x0WGDl8Jowlycsdmxl2+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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