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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e3624771ea5c0e7ab9762e71f4fc39f62c83b9cfbe6508bb3a3fc2d4d5e06c' 
  AND token = 'oxfuE71B7HCbfeBldx9V/kos2LlfUm/RNs+GnIA+XGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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